Transmission Control Module Governor Pressure Sensor Fault
Governor pressure sensor signal is out of range or not present.
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What it means (plain English)
The Transmission Control Module (TCM) uses the governor pressure sensor to monitor the pressure in the transmission. If this sensor isn't working, it can't properly control how the vehicle shifts gears.
What the computer is actually seeing
The TCM needs the governor pressure to be between 50 and 200 psi for proper function. If it sees a voltage outside the 0.5 to 4.5 volts range corresponding to this pressure, it will set the fault.
What a healthy reading looks like
Governor pressure should register between 50 to 200 psi, with a corresponding voltage input of 0.5V to 4.5V.
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.
- 1Check the transmission fluid level and condition; it should be at the correct level and not burnt or contaminated. Decision: If low or dirty, address fluid issue first.
- 2Inspect the wiring and connectors of the governor pressure sensor for damage or corrosion. Decision: If damaged, repair or replace wiring/connectors.
- 3Test the voltage at the governor pressure sensor harness while the engine is running. Expected voltage should be between 0.5V to 4.5V. Decision: If out of range, replace the governor pressure sensor. If in range, further diagnosis needed for TCM.
Common causes
- Faulty governor pressure sensor
- Wiring issue between the sensor and TCM
- Transmission fluid low or contaminated
- Faulty Transmission Control Module (TCM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to address the issue soon to prevent further transmission damage, though it may be drivable for a short distance.
Will the code come back after clearing?
If the underlying issue isn't fixed, the code is likely to return after clearing.
Why does this code sometimes pair with SPN 1880?
Both codes are related to transmission pressure control; one may trigger if the other has failed.
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