Is it safe to drive with P0692?

Highway driving is usually fine because airflow keeps the radiator cool without the fan. The risk is anywhere you idle or crawl — traffic, parking lots, drive-throughs — especially with the AC on. If the open circuit stops the primary fan from running, coolant temperature can climb past safe levels in a few minutes, and a single overheat can warp the cylinder head. Avoid stop-and-go driving until it's repaired.

How do I find the open circuit causing P0692?

Start at the relay: swap in a known-good relay to rule it out. Then, with a scan tool commanding the fan, measure voltage along the control wire from the PCM to the relay — the point where the expected drop disappears is near the break. Inspect connectors at the relay socket and fan for corrosion or spread terminals, and check for harness sections that were disturbed during recent service. A wiggle test while watching the circuit can locate an intermittent open.

What's the difference between P0692 and P0691?

Both are primary cooling fan control codes for the same circuit, but they describe opposite electrical faults. P0692 ('circuit high') means the circuit stayed high when commanded low — an open or bad connection. P0691 ('circuit low') means the circuit went toward ground when it shouldn't — a short to ground or a relay shorted low. The repair targets overlap (relay, wiring, connector, fan motor), but P0692 steers you toward opens first.

OBD-II trouble code

P0692: Cooling Fan 1 Control Circuit High

Q: What does 'circuit high' mean in P0692?

It means the PCM commanded the fan 1 control circuit to pull low to switch the relay on, but the voltage stayed high. Electrically that points to an open circuit — a broken control wire, a relay with an open coil, or a corroded connection that blocks current. Its opposite is P0691, 'circuit low,' where the voltage is pulled toward ground unexpectedly. With P0692 you focus on opens and bad connections rather than shorts to ground.

The engine computer detected high voltage — or an open circuit — on the control circuit for the primary cooling fan relay. The PCM expected the circuit to pull low and it didn't, pointing to an open wire, a failed relay, or a bad connection. Overheating in slow traffic is the main risk.

Quick facts

System: Powertrain
Category: Cooling / Electrical
Severity: High severity
Drivable: Usually safe to drive short-term
Repair cost range: $50 – $650
DIY difficulty: Intermediate DIY

What does P0692 mean?

P0692 is the electrical opposite of P0691. The powertrain control module switches the primary cooling fan (fan 1) through a relay and watches the voltage on that control circuit. 'Circuit high' means the PCM commanded the circuit to pull low to energize the relay but the voltage stayed high — the classic signature of an open circuit, a broken or disconnected control wire, a relay with an open coil, or a corroded connection that won't let current flow. Its companion code P0691 ('circuit low') describes the opposite condition, where the circuit is pulled toward ground when it shouldn't be.

In practice, P0692 most often traces to an open in the control wiring, a failed relay, or a corroded/backed-out terminal at the relay socket or fan connector. Because the fan can't be commanded on when the control circuit is open, the more common real-world consequence of P0692 is a fan that simply doesn't run rather than one that runs constantly. The PCM reads the fault electrically, so the code can be stored whether or not you've noticed the engine getting hot.

The danger here is overheating, not driveability. At highway speed the engine stays cool because ram airflow through the radiator is enough without the fan. The risk shows up in stop-and-go traffic, at idle, with the AC running, or right after a hard climb — exactly when the primary fan is supposed to carry the cooling load. If the open circuit keeps the fan from running, coolant temperature can climb into the danger zone quickly, and a single overheating event can warp the cylinder head or fail the head gasket. Treat P0692 as a code that limits where you drive until it's repaired.

Common causes

Open or broken cooling fan 1 control wire between the relay and the PCM
Failed cooling fan 1 relay (open coil or burned contacts)
Corroded, loose, or backed-out terminal at the relay socket or fan connector
Disconnected fan connector or harness pulled apart during prior service
Open fan motor winding that breaks circuit continuity
Damaged or corroded ground for the fan circuit
Failed PCM fan-control driver (rare — confirm the wiring and relay first)

Symptoms

Check engine light on with P0692 stored
Primary cooling fan not running when it should
Engine temperature climbing in stop-and-go traffic or at idle
Reduced AC performance at idle and low speed
Coolant boiling over from the reservoir after a hot shutdown
Often no symptoms at highway speed
No blown fuse, because an open circuit doesn't draw excess current

Diagnostic steps

1.Inspect the fan 1 control wiring from the PCM to the relay, looking for breaks, burned sections, and disconnected or backed-out connectors.
2.Swap the fan 1 relay with an identical relay from a non-critical circuit, or bench-test the coil and contacts for an open.
3.With the key on, use a scan tool to command the fan and measure voltage on the control circuit — a circuit that stays high while commanded on confirms the open.
4.Check the relay socket and fan motor connector for corrosion, spread terminals, and poor contact.
5.Measure the fan motor winding resistance to rule out an internal open.
6.Verify the circuit ground and power feed are intact before suspecting the PCM.
7.If wiring, relay, connectors, and motor all check out, have the PCM fan-control driver evaluated.

Repair cost

$50 – $650

A cooling fan relay is $20-$80 in parts, so a relay-only fix runs about $80-$150 at a shop. Repairing an open or corroded control wire or connector typically runs $100-$300 depending on access. If the fan motor is open or the full fan-and-shroud assembly needs replacing, expect $300-$650. Compared with the $1,500-$3,000 a single overheating event can cost in head gasket or cylinder head damage, fixing P0692 promptly is well worth it.

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DIY vs shop

This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.

Related codes

P0480 P0481 P0482 P0483 P0526 P0691