Starter Relay Circuit Malfunction
The P0615 code indicates a fault in the starter relay circuit, which controls the starter motor engagement. This can be due to a faulty relay, wiring issues, or a problem with the powertrain control module (PCM). The starter relay receives a signal from the PCM to close and send battery voltage to the starter solenoid. When the circuit fails, the engine may not crank or start.
01. Most Common Causes
- Faulty starter relay
- Open or shorted wiring in the starter relay circuit
- Corroded or loose connectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine does not crank
- Engine cranks slowly or intermittently
- No start condition
- Starter relay clicks but engine does not turn
03. Step-by-Step Diagnosis
Step 1: Check for blown fuses related to the starter circuit.
Step 2: Test the starter relay by swapping with a known good relay of the same type.
Step 3: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 4: Measure voltage at the relay coil and switch terminals with a multimeter.
Step 5: If all else fails, test the PCM output signal to the relay.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, because the vehicle may not start or may stall unexpectedly, leaving you stranded.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the root cause.