What Does P007B Mean?
This code indicates the charge air cooler temperature sensor on bank 1 is providing readings outside the expected range or not responding correctly to changes in operating conditions. The sensor signal is within electrical limits but does not correlate with expected charge air temperatures based on ambient conditions, boost pressure, and engine load. This causes the ECM to use default charge air temperature values, reducing boost efficiency.
Common Causes
30%
Degraded charge air cooler temperature sensor with slow or inaccurate thermistor response due to age or contamination
25%
Restricted or leaking charge air cooler (intercooler) causing abnormal air temperatures that the ECM interprets as sensor error
20%
Intermittent wiring connection causing signal fluctuations that fail the rationality check
15%
Sensor installed in wrong location or aftermarket intercooler without proper sensor bung placement
10%
Boost leak before the sensor allowing ambient air to affect readings
Diagnostic Steps
1
Compare the CAC temperature sensor reading with the intake air temperature (IAT) and ambient temperature sensors at cold start. All three should read within 5°F (3°C) of each other when the engine is cold and has been sitting for 6+ hours.
2
With the engine running under boost, monitor the CAC temperature sensor reading. It should show a temperature rise from ambient proportional to boost pressure. If it remains static or erratic, suspect sensor or wiring issues.
3
Inspect the intercooler for external blockage (debris, bugs) or internal contamination (oil from turbo seals). A restricted intercooler will show abnormally high charge air temperatures.
4
Check all boost piping connections and clamps for leaks using a boost leak tester (pressurize to 15-20 PSI). Leaks can allow unmetered ambient air to reach the sensor.
5
Remove the CAC temperature sensor and bench test it in a controlled temperature water bath, measuring resistance at known temperatures against the manufacturer specification chart.
Estimated Repair Cost
$50 - $500
Parts + labor, varies by vehicle and location
This code indicates the charge air cooler temperature sensor on bank 1 is providing readings outside the expected range or not responding correctly to changes in operating conditions. The sensor signal is within electrical limits but does not correlate with expected charge air temperatures based on ...
The most common cause of P007B (Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 1) is: Degraded charge air cooler temperature sensor with slow or inaccurate thermistor response due to age or contamination
Typical repair costs for P007B range from $50 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The ECM may limit boost pressure as a protective measure, causing noticeable power reduction. This can affect safe passing and merging ability, particularly at highway speeds.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P007B to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Turbocharger/Supercharger Boost Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
