What Does P2797 Mean?
The auxiliary transmission fluid pump is not performing as expected, though the electrical circuit tests normal. This indicates mechanical pump failure or insufficient pressure/flow despite proper electrical operation.
Common Causes
40%
Worn or damaged auxiliary pump internal components causing low flow
25%
Clogged pump inlet screen or filter restricting fluid flow
15%
Low transmission fluid level affecting pump operation
10%
Internal transmission fluid leak reducing auxiliary pump pressure
10%
Faulty transmission fluid pressure sensor giving incorrect readings
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition; top off if low and inspect for contamination
2
Step 2: Monitor transmission fluid pressure with scan tool during auxiliary pump operation
3
Step 3: Test auxiliary pump current draw (should match specifications, typically 5-15 amps)
4
Step 4: Listen for abnormal pump noise indicating internal wear or cavitation
5
Step 5: Remove and inspect pump inlet screen for debris; pressure test pump output if accessible
Estimated Repair Cost
$400 - $1,800
Parts + labor, varies by vehicle and location
The auxiliary transmission fluid pump is not performing as expected, though the electrical circuit tests normal. This indicates mechanical pump failure or insufficient pressure/flow despite proper electrical operation.
The most common cause of P2797 (Auxiliary Transmission Fluid Pump Performance) is: Worn or damaged auxiliary pump internal components causing low flow
Typical repair costs for P2797 range from $400 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Continued driving may cause transmission overheating and internal damage due to inadequate lubrication. Avoid extended idling or stop-and-go traffic until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2797 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Lubrication System
Difficulty
Type
Generic (SAE)
Recommended Tools
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