ECM/PCM Power Relay Sense Circuit Range/Performance
The P2510 code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an abnormal voltage signal from the power relay sense circuit. This circuit monitors the voltage output of the main relay that supplies power to the ECM/PCM. When the sensed voltage is outside the expected range or the relay does not operate correctly, the code is set. This can lead to intermittent power loss to the ECM, causing drivability issues.
01. Most Common Causes
- Faulty ECM/PCM power relay
- Corroded or loose relay socket connections
- Open or shorted wiring in the relay sense circuit
- Failed ECM/PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may stall or not start
- Intermittent electrical issues (e.g., radio, lights flickering)
- Reduced engine performance or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and note freeze frame data.
Step 2: Inspect the ECM/PCM power relay and its socket for corrosion, damage, or loose pins.
Step 3: Test relay operation: apply battery voltage to the coil and check continuity across the switch contacts.
Step 4: Check voltage at the relay sense circuit wire (typically at the ECM connector) with key on; should be near battery voltage.
Step 5: If voltage is missing or low, check for open/short in wiring between relay and ECM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The code can cause the engine to stall unexpectedly, leading to a loss of power steering and brakes, which is dangerous.
How much does it cost to fix?▼
Typically $50-$150 for a relay replacement, but if wiring repair or ECM replacement is needed, costs can exceed $500.