Starter Relay Circuit Malfunction
The P0615 code indicates a fault in the starter relay circuit, which is responsible for sending battery voltage to the starter solenoid when the ignition key is turned. This can be caused by a faulty relay, wiring issues, a blown fuse, or a problem with the engine control module (ECM). The ECM monitors the relay control circuit and sets this code if it detects an open, short, or excessive resistance.
1. Most Common Causes
- Faulty starter relay
- Blown fuse or fusible link
- Open or shorted wiring in the relay circuit
- Corroded or loose relay connections
- Faulty ignition switch
- Failed engine control module (ECM)
2. Symptoms You Will Notice
- Engine cranks slowly or does not crank at all
- Engine starts intermittently
- Clicking sound from the starter relay when turning the key
- No engine crank with the key in the start position
- Starter stays engaged after engine starts (rare)
3. Step-by-Step Diagnosis
Step 1: Check for blown fuses related to the starter relay circuit.
Step 2: Inspect the starter relay for signs of damage or corrosion; test relay operation with a multimeter.
Step 3: Verify battery voltage at the relay coil and switch terminals using a wiring diagram.
Step 4: Check for continuity and shorts in the wiring between the relay, ignition switch, and ECM.
Step 5: If all else is fine, test the ECM output to the relay; replace ECM if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not start or could stall unexpectedly, leaving you stranded. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50 to $150 for parts and labor, depending on the cause. A relay replacement is cheap, but ECM replacement can be more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.