P1812
Transmission Fluid Overtemperature
P1812 is an OBD-II diagnostic trouble code meaning: Transmission Fluid Overtemperature. Common causes: low transmission fluid level, contaminated or used atf. Estimated repair cost: $17–89.
Symptoms
- Burnt transmission fluid smell
- Difficulty shifting gears
- Dips or jerks when switching
- Reduced engine power
- Activation of emergency operation mode of automatic transmission
Causes
- Low transmission fluid level
- Contaminated or used ATF
- Malfunction of the automatic transmission cooling radiator
- Problems with the cooling system thermostat
- Excessive load on the transmission (towing, aggressive driving)
How to Fix
- Check the level and condition of the transmission fluid
- Replace ATF fluid and filter if necessary
- Check the operation of the transmission cooling system
- Diagnose the automatic transmission cooling radiator for blockages
- Check the operation of the engine thermostat
Related codes
Error P1812 by Vehicle Brand
FAQ
What does the P1812 code mean?
P1812 is an OBD-II diagnostic trouble code that indicates: Transmission Fluid Overtemperature
What causes a P1812 error code?
The most common causes of P1812 include: Low transmission fluid level; Contaminated or used ATF; Malfunction of the automatic transmission cooling radiator; Problems with the cooling system thermostat.
How do I fix a P1812 diagnostic trouble code?
To fix P1812: Check the level and condition of the transmission fluid. Replace ATF fluid and filter if necessary. Check the operation of the transmission cooling system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1812?
Do not drive — repair immediately
How much does it cost to fix P1812?
The estimated repair cost for P1812 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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