What Does P007A Mean?
This code indicates a general electrical malfunction in the charge air cooler (intercooler) temperature sensor circuit on bank 1. The ECM cannot read a valid temperature signal from the sensor located downstream of the intercooler. This prevents the ECM from properly adjusting boost pressure and fuel delivery based on charge air temperature, potentially leading to detonation or reduced performance in turbocharged/supercharged engines.
Common Causes
35%
Failed charge air cooler temperature sensor with internal thermistor open or shorted, reading outside the expected 0.5-4.5V range
25%
Damaged or corroded wiring between the CAC temperature sensor and ECM due to underhood heat and vibration
20%
Poor connector contact at the sensor or ECM due to corrosion, spread terminals, or missing seal allowing moisture ingress
15%
Missing or compromised 5V reference voltage from ECM to the sensor circuit
5%
Faulty ECM analog-to-digital input for the CAC temperature sensor channel
Diagnostic Steps
1
With the ignition on and engine off, backprobe the CAC temperature sensor connector to verify 5V reference voltage on the signal wire and proper ground on the return wire. Expected values: reference 4.9-5.1V, ground less than 0.1V.
2
Disconnect the CAC temperature sensor and measure its resistance. At 68°F (20°C), a typical NTC thermistor should read approximately 2,000-3,000 ohms. OL or near 0 ohms indicates a failed sensor.
3
Inspect the sensor connector for signs of moisture, corrosion, or thermal damage. The intercooler environment is prone to heat cycling and condensation.
4
Check the wiring harness from the sensor to the ECM for continuity and shorts. Verify no short to ground or short to power exists on either the signal or reference wire.
5
If the sensor and wiring are verified good, check whether other sensors sharing the same 5V reference circuit are also faulting, which would indicate a reference circuit problem rather than a sensor issue.
Estimated Repair Cost
$60 - $300
Parts + labor, varies by vehicle and location
This code indicates a general electrical malfunction in the charge air cooler (intercooler) temperature sensor circuit on bank 1. The ECM cannot read a valid temperature signal from the sensor located downstream of the intercooler. This prevents the ECM from properly adjusting boost pressure and fue...
The most common cause of P007A (Charge Air Cooler Temperature Sensor Circuit Bank 1) is: Failed charge air cooler temperature sensor with internal thermistor open or shorted, reading outside the expected 0.5-4.5V range
Typical repair costs for P007A range from $60 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without accurate charge air temperature data, the ECM cannot properly protect against detonation. The engine may enter a reduced power mode, limiting acceleration capability in traffic.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P007A to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger/Supercharger Boost Control System
Difficulty
Type
Generic (SAE)
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