Ambient Air Temperature Sensor Circuit Malfunction
The P0070 code indicates a problem in the ambient air temperature sensor circuit. This sensor measures outside air temperature and is used by the engine control module (ECM) for various functions, including HVAC control and engine performance adjustments. The ECM detects a voltage or resistance reading outside the expected range, often due to a faulty sensor, damaged wiring, or poor electrical connection.
01. Most Common Causes
- Faulty ambient air temperature sensor
- Damaged or corroded wiring/connector
- Short or open circuit in the sensor circuit
- Poor electrical connection
02. Symptoms You Will Notice
- Inaccurate outside temperature display
- HVAC system not working properly
- Check Engine Light illuminated
- Possible impact on engine performance in some vehicles
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the ambient air temperature sensor and its wiring for damage or corrosion.
Step 3: Test the sensor's resistance with a multimeter and compare to manufacturer specifications.
Step 4: Check for voltage and ground at the sensor connector; repair or replace as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the HVAC system may not work correctly, and the check engine light will be on. It's best to diagnose and fix it soon.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor. The sensor itself is inexpensive, but labor costs vary.