OBD-II trouble code
P2036: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 2
This is the exhaust sensor most often broken by the last repair rather than by age. It has to come out for aftertreatment work, it seizes in its boss over time, and a great many of these arrive days after a large invoice.
Quick facts
- System
- Powertrain
- Category
- Exhaust / Aftertreatment
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $160 – $1,100
- DIY difficulty
- Advanced DIY
Browse every code in P2000–P20E8, or start from the full code library.
What does P2036 mean?
Before treating this as a component failure, it is worth asking a question that has nothing to do with electricity: what work has been done under this vehicle lately?
Bank 2's filter inlet sensor occupies a position that is unusually exposed to human hands. It has to be disconnected and usually removed for a long list of jobs — replacing or cleaning a particulate filter, changing an oxidation catalyst, dropping a downpipe, turbocharger work, and on many layouts even a starter or a gearbox. It is also awkward to reach, which means it tends to be handled at arm's length, in the dark, by someone whose actual job that day was something else. Add that this code describes an open circuit and the pattern becomes obvious: a large proportion of these appear within days of unrelated aftertreatment work, from a connector that was pushed together but never latched, a lead that was left resting against the pipe and has since melted through, or a pigtail twisted past its limit while the sensor was being wound out.
The seizing is the specific mechanism worth understanding. These sensors thread into a boss that spends its life hot, and after tens of thousands of miles the threads bond. Removing one after long service is genuinely difficult. What happens in practice is that the sensor body turns freely while the lead does not — so the wire winds up, the conductor inside stretches, and it either breaks immediately or breaks a few hundred miles later. The lesson is that these are removed with heat and penetrant and patience, supporting the lead, never by force alone; and that a seized one that shears in its boss turns a modest part into a thread repair or a manifold job, which is a far larger conversation.
The electrical picture behind the code is straightforward. The module holds this line up through an internal resistor and lets the sensing element pull it down; a reading pinned at the ceiling means nothing is pulling. That is an open circuit — a broken conductor, an unlatched connector, a backed-out terminal, or an element that has burned out. A short to battery voltage would produce the same reading, but very little under the vehicle carrying power runs anywhere near this lead, so it is rarely the answer.
The consequence is the loud kind. As with any implausibly high filter inlet reading, most modules abort regeneration and reduce power immediately, because an overheating filter is a genuine hazard to a ceramic substrate and no strategy will gamble on it. On a dual-path exhaust that also means one half of the aftertreatment system stops being cleaned, so the fault has a slow cost as well as an immediate one.
There is a small piece of good news attached to the diagnosis. Because the failure is nearly always mechanical and nearly always recent, it is often visible. A connector hanging loose, a lead with a shiny melted flat spot where it has lain on the pipe, or a pigtail pulled tight and kinked at the sensor body will frequently be found by looking rather than by testing — and looking is far cheaper than gaining access with tools.
Common causes
- Connector left unlatched after recent aftertreatment, exhaust or driveline work
- Conductor broken inside the pigtail after the sensor was wound out while seized
- Lead melted through where it was left resting on the pipe following a previous repair
- Sensing element burned out after extended service at aftertreatment temperatures
- Terminal backed out of the connector housing, or contact springs fretted open
- Crimp failed at the sensor body, a common outcome of repeated thermal cycling
- Harness severed by a stone strike, road debris or a lift arm placed against the exhaust
- Sensor sheared or loosened in its boss, breaking the ground path on body-grounded designs
- Open in a shared ground or reference affecting bank 2's aftertreatment sensors together
- Replacement sensor of the wrong specification or with a damaged connector from the outset
Symptoms
- Warning lamp and reduced power arriving together, often shortly after other work was done
- Live data showing bank 2's filter inlet temperature at maximum even on a cold engine
- Regeneration aborting partway through with an abrupt end to any burning smell
- Bank 2's soot load climbing while bank 1's continues to be cleaned normally
- Reduced power that clears on a restart at first and then becomes permanent
- Visible damage under the vehicle — a hanging connector, a melted lead, a kinked pigtail
- Cooling fans running hard immediately after an aborted regeneration attempt
- Restriction or backpressure codes on the affected bank appearing later
- Fault dated within days of a filter, catalyst, turbocharger or gearbox repair
Diagnostic steps
- 1.Ask what has been done under the vehicle recently and when. This sensor is disturbed by a long list of unrelated jobs, and a repair date that lines up with the fault date is usually the diagnosis.
- 2.Inspect physically before testing. A connector that is not latched, a lead with a melted flat spot, or a pigtail kinked at the sensor body is frequently visible and ends the job immediately.
- 3.Check the reading on a cold engine. Maximum temperature on a vehicle that has stood overnight confirms an open circuit rather than any real exhaust condition.
- 4.Bridge the two sensor pins at the connector. If the value drops to the cold end of the scale, the harness back to the module is intact and the fault is the sensor or its pigtail.
- 5.If bridging changes nothing, test each conductor for continuity to the module while flexing the harness, since an open at a marginal joint will not show on a static check.
- 6.Examine the connector for backed-out terminals and weakened contact springs. Thermal cycling opens contacts here without any wire being damaged.
- 7.Measure the sensor's resistance. An element that has failed open reads infinite and does not respond to warming the tip.
- 8.Confirm the sensor is tight in its boss and, on grounded designs, that the mounting surface is clean and making contact.
- 9.If other aftertreatment sensors on the same bank are also misreading, test the shared ground and reference supply before condemning any single sensor.
- 10.When removing a seized sensor, use heat and penetrant, support the lead so it cannot wind up, and accept that patience is cheaper than a stripped boss. After fitting, route and clip the lead clear of the pipe and command a regeneration to confirm it completes.
Repair cost
$160 – $1,100
Diagnosis is $110 to $220, and a visual inspection often finds the fault before any of that is used up. The sensor is $60 to $260 with 1 to 3 hours of labour at this position. Repairing a broken pigtail, re-terminating a crimp or fitting a new connector body is $120 to $400 and is frequently the whole job. The figure that pushes the top of this range is a seized sensor that shears: extraction, thread repair or in the worst case removing the pipe or manifold adds $250 to $700. If the bank has gone weeks without regenerating, a forced regeneration is $150 to $400 and cleaning starts around $900.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with exhaust gas temperature sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.