Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected that the fluid in the transmission is getting too hot. Think of it like a warning light telling you that something is overheating.
The code indicates that the temperature of the transmission fluid is higher than normal, which can affect the performance of the transmission.
The P1AA7 code is triggered when the transmission control module (TCM) detects that the temperature of the transmission fluid is above the specified limit. This condition can be caused by a malfunction in the electric or auxiliary transmission fluid pump, or due to insufficient cooling.
• Transmission overheating warning light
• Poor transmission performance
• Unusual noises from the transmission
• Faulty electric/auxiliary transmission fluid pump
• Low transmission fluid level
• Clogged transmission fluid cooler
Transmission: A system in a vehicle that transmits power from the engine to the wheels.
Fluid Pump: A device that moves fluid through the transmission system.
• Check the transmission fluid level and condition.
• Inspect the transmission fluid pump for proper operation.
• Examine the transmission fluid cooler for blockages.
• Replace or repair the transmission fluid pump.
• Refill or replace the transmission fluid.
• Clean or replace the transmission fluid cooler.
• OBD-II scanner
• Transmission fluid level gauge
• Wrench set
$200 - $800
Moderate
• Chevrolet Volt
• Cadillac ELR
• Chevrolet Malibu Hybrid
• Regularly check transmission fluid levels.
• Schedule routine transmission maintenance.
• Ensure proper operation of the transmission cooling system.
Transmission Performance
• Avoid driving the vehicle until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Transmission issues may be covered under powertrain warranty if within the warranty period.
This code has been associated with hybrid and electric vehicles where electric pumps are used to circulate transmission fluid.
High – Driving with this issue can cause severe damage to the transmission.
Ignoring this code can lead to transmission failure, which could result in loss of vehicle control.
• Vehicle at operating temperature
• Transmission under load
The electric/auxiliary transmission fluid pump is typically located near the transmission assembly.
Q: Can I drive with a P1AA7 code?
A: It's not recommended to drive with this code active, as it can lead to severe transmission damage.
Q: How do I know if my transmission fluid is too hot?
A: You may notice a warning light on the dashboard, poor transmission performance, or unusual noises.
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