Cooling Fan Control Circuit Short to Ground
This code means there's a short in the cooling fan control circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The cooling fan control circuit has a short, causing the fan to malfunction. This can overheat the engine if not fixed.
What the computer is actually seeing
The control module detects a low voltage signal in the cooling fan circuit, typically below 1 volt, indicating a short to ground.
What a healthy reading looks like
The cooling fan circuit should show approximately 12 volts when the fan is operating, and around 0-5 volts at rest.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors for damage or corrosion, especially around the cooling fan and relay. If damaged, repair or replace the wiring. Decision: Is there any visible damage? (Yes: Repair/replace. No: Proceed to step 2.)
- 22. Check the cooling fan relay for proper operation by testing it with a multimeter. It should click when activated and show continuity. Decision: Is the relay functioning? (Yes: Proceed to step 3. No: Replace relay.)
- 33. Measure the voltage at the fan connector while the engine is running and the A/C is on. You should see 12 volts. Decision: Is the voltage present? (Yes: Check PCM. No: Focus on wiring between relay and PCM.)
- 44. If the PCM is suspected, perform further tests on the output signal from the PCM related to the cooling fan control. Decision: Is the PCM sending the correct signal? (Yes: PCM may be faulty. No: Repair wiring or connectors.)
Common causes
- Damaged wiring in the cooling fan control circuit
- Faulty cooling fan relay
- Malfunctioning PCM (Powertrain Control Module)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not safe, as overheating can occur. Fix it soon.
Will this code come back after I clear it?
Yes, if the root cause isn't addressed, the code will reappear.
Why does this code pair with B2493?
B2493 indicates a related issue in the cooling fan control circuit, often stemming from the same problem.
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