EGR Position Sensor - Voltage Too High
The EGR position sensor voltage is above the normal range.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The Engine Control Module (ECM) sees that the voltage from the EGR position sensor is over 4.5 volts when it shouldn't be, indicating the sensor or circuit is faulty.
What the computer is actually seeing
The ECM is expecting the EGR position sensor voltage to be between 0.5 and 4.5 volts. When it exceeds 4.5 volts, it triggers this fault code.
What a healthy reading looks like
EGR position sensor voltage should stay between 0.5V to 4.5V while the engine is operating.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the EGR position sensor connector for corrosion or damage. If damaged, repair/replace the connector before further testing.
- 2Measure the EGR position sensor voltage with the key on and engine off. If it's above 4.5 volts, replace the sensor.
- 3Inspect the wiring harness for shorts to power or ground. Use a multimeter to check for continuity and insulation resistance.
Common causes
- Faulty EGR position sensor
- Wiring issue or short in the sensor circuit
- ECM software issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; the vehicle can be driven but should be repaired soon to avoid EGR system issues.
Will this problem come back after fixing?
If the underlying cause (like wiring or connectors) isn't addressed, the code may reappear.
Why does this code pair with SPN 1236?
SPN 1236 and 1237 are related; they both indicate issues with the EGR system, such as performance or position.
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