Does my transmission even have a solenoid D?

Quite possibly not, and this is the first thing to establish. The lettered slots in the standard code set exist so every manufacturer's transmission can be described in one scheme, and each maker maps its own devices into them differently. On some transmissions D is a genuine fourth shift valve; on others it is something the factory documentation calls by another name; and some have no fourth shift solenoid at all. Read the fault with manufacturer-level diagnostics before ordering anything.

Why is the quote so much higher than for solenoid C?

Because of the kind of transmission that has a fourth shift solenoid. Fourth shift solenoids show up on six-, eight-, nine- and ten-speed units, and some of them integrate the valve body, the solenoids and the control module into one assembly. On that design there may be no individual solenoid available as a service part — the replacement is the whole unit, and it needs coding to the vehicle afterwards. It is worth confirming which construction your transmission uses before accepting a quote, since the two answers are very far apart.

The transmission was repaired but shifts badly and the code came back. What was missed?

The adaptations are one thing to check. Multi-speed transmissions continuously learn shift pressures and timing to compensate for wear and fluid condition, and those learned values are stored in the module. Fit new hardware without resetting them and the module keeps applying corrections tuned to the old parts, which produces harsh or flared shifts and can be enough to set codes again. Resetting adaptations and completing the manufacturer's relearn drive is part of the repair, not an optional extra.

The car feels sluggish from a standstill but fine at speed. Is that related?

It is a recognisable pattern. When a multi-speed transmission loses a solenoid it may fall back to a gear it can hold safely, and on some of these units that gear is a middle ratio rather than the lowest one. Starting off in a mid gear feels heavy and slow, while cruising in that same gear feels almost normal. It is the transmission protecting itself rather than a separate engine problem, and it should resolve when the underlying fault is fixed.

OBD-II trouble code

P0765: Shift Solenoid "D" Malfunction

A fault on the fourth shift solenoid. Two things make this code different from its lower-lettered siblings: the letter D does not identify the same device across manufacturers, and some of the transmissions that have one are built so you cannot buy a single solenoid at all.

High severityPowertrainTransmission / Shift ControlDrivable short-term

Quick facts

System: Powertrain
Category: Transmission / Shift Control
Severity: High severity
Drivable: Usually safe to drive short-term
Repair cost range: $300 – $900 (shift solenoid replacement)
DIY difficulty: Shop recommended

One of 42 shift solenoid codes

P0765 sits in a grid: one axis is which solenoid the letter refers to, the other is what went wrong with it. Each cell is a genuinely different fault with its own diagnosis — but codes from the same row or column often appear together, and what a pairing means is usually the fastest way in. The hub page lays out all 42 and explains how to read them against each other.

See all shift solenoid codes →

Browse every code in P0700–P0799, or start from the full code library.

What does P0765 mean?

This is the general malfunction code for the fourth shift solenoid, covering electrical and hydraulic causes alike. Before going any further, though, two facts about the letter D deserve more attention than the code definition gives them, because between them they determine whether this repair is straightforward or expensive.

The first is that the letter is a slot in a generic list, not a description of a part. The standardised code set has to accommodate every manufacturer's transmission, so it provides lettered slots and each manufacturer maps its own devices into them. That mapping is not consistent. On one transmission the device behind D really is a fourth on/off shift valve. On another it may be a device the manufacturer's own documentation calls something else entirely, and on some transmissions there is no fourth shift solenoid at all — in which case a generic scan tool reporting P0765 has told you something is wrong in the shift solenoid circuits without telling you which one. The practical instruction is unglamorous but it is the highest-value step on this page: read the code with a tool that speaks the manufacturer's own diagnostics, or look up the factory designation for your specific transmission, before ordering a part. People buy solenoids for this code that their vehicle does not contain.

The second fact follows from which transmissions have a fourth shift solenoid in the first place. It takes a lot of ratios to need four elements in the combination, so this code is used on multi-speed units — six, eight, nine and ten speeds. Some of those are built as an integrated assembly, with the valve body, all of the solenoids, the wiring and, where the unit includes it, the control module combined into a single serviceable unit. That is excellent engineering and terrible news for a single-solenoid repair, because on such a transmission there may be no individual solenoid to buy. The service part is the whole assembly, new or remanufactured, and coding to the vehicle is part of that assembly job where the service information requires it. A repair that on an older three-solenoid transmission would have been a few hundred can be several times that here — and that is a reason to be certain of the diagnosis, not a reason to skip it.

The third thing worth knowing about these transmissions concerns what happens after the repair. Multi-speed units lean heavily on adaptive learning: the module continuously adjusts shift pressures and timing to compensate for clutch wear and fluid condition, and those learned values are stored. Fit new hardware and leave the old adaptations in place and the shifts can be poor, harsh or flared even though nothing is wrong — and in some cases that misbehaviour is enough to set codes again. Resetting the adaptations and driving the relearn procedure is part of the job rather than an optional extra, and it is one reason a repair can be judged a failure when the mechanical work was actually correct.

As for symptoms, they tend to be narrower than a total transmission failure. A fourth solenoid participates in a subset of the gear patterns, so its loss removes or spoils particular shifts rather than all of them, and the module may fall back to a gear it can hold safely. On some multi-speed units that fallback is a middle ratio rather than a low one, which means the car can feel unexpectedly lazy pulling away while still cruising acceptably — a symptom pattern that catches people out and is worth recognising for what it is.

Common causes

Fault elsewhere in the solenoid circuits reported into the generic D slot by a scan tool that does not speak the manufacturer's own codes
Contaminated or degraded fluid producing varnish on a valve that is not commanded in every gear
External case connector corrosion or fluid weeping through the connector body
Adaptive values left unreset after previous transmission work, producing shift behaviour that re-sets the code
Sticking valve or spool in the valve body on the affected circuit
Failed fourth solenoid coil, open or shorted
Internal wiring or connector failure within an integrated mechatronic assembly
Control module fault within an integrated valve body and module unit

Symptoms

Check engine light with P0765 stored
One particular upshift missing, delayed or harsh while the rest of the range behaves
Slipping or flaring during the affected shift
Fallback to a fixed gear, on some multi-speed units, a middle ratio, giving lazy acceleration from rest with acceptable cruising
Reduced fuel economy from holding an unsuitable gear
Shift quality that has been poor since an earlier transmission repair
Scan tool naming a solenoid the vehicle's own documentation does not use
Codes returning shortly after a repair when adaptations were not reset

Diagnostic steps

1.Establish what the letter D refers to on this specific transmission before anything else. Use manufacturer-level diagnostics or factory documentation rather than a generic code definition.
2.Confirm the transmission actually has a fourth shift solenoid. If it does not, the fault lies elsewhere in the solenoid circuits and the code is a generic slot rather than an identification.
3.Determine whether the transmission uses an integrated valve body and module assembly, because that decides whether an individual solenoid is even a service part.
4.Check fluid level and condition, and note the service history — a valve that is not commanded in every gear is one place varnish can accumulate.
5.Road test with live data to identify precisely which shift is affected and whether the unit has defaulted to a fixed gear. Record the session with the tool's logging function and read it back stopped, or take someone along to watch the screen — this code's whole symptom is a shift quality, so the test happens at road speed and the driver's attention belongs on the road.
6.Measure the solenoid's coil resistance against specification where the solenoid is individually accessible and testable. Where reaching it means opening the pan, support the vehicle on rated stands and give the fluid time to cool first — it comes out at operating temperature and there are several quarts of it.
7.Inspect the external case connector for corrosion and for fluid tracking through the connector body.
8.Ask whether the transmission has had previous work and whether adaptations were reset afterwards.
9.After any repair, reset the adaptive values and complete the manufacturer's relearn drive procedure before judging the outcome.

Repair cost

$300 – $900 (shift solenoid replacement)

This pair is shift solenoid D replacement. AutoZone's published band for a simple solenoid replacement is $300–$900, parts and labor. A mechatronic unit that is sold only as an assembly is not the $300–$900 solenoid band. Quote that assembly from the parts catalog. The replacement band below is the opened-transmission outcome, not a mechatronic price. RepairPal's transmission fluid change average, updated 3 September 2026, is $294–$356, with vehicle examples from about $162 to about $463. Dropping the pan includes that fluid service. AutoZone's published band for a transmission rebuild is $1,800–$3,500, and for a full replacement $4,000–$8,000. A rebuild or a replacement is not in this pair.

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DIY vs shop

Leave this one to a qualified shop. The barrier here is internal hydraulic and mechanical work, fluid handling at temperature, and an adaptive relearn afterwards without which a correct repair still shifts badly. DIY attempts often produce a more expensive problem than the original code.