Exhaust Gas Recirculation (EGR) Position Sensor Circuit Voltage High
The EGR position sensor has detected a high voltage condition.
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What it means (plain English)
The EGR system helps reduce emissions by recirculating exhaust gases back into the engine, but if the position sensor sees a voltage higher than what’s normal (over 4.92 volts), it throws this code.
What the computer is actually seeing
The ECM monitors the EGR position sensor for a voltage level that generally should be between 0.5 to 4.5 volts during operation. When it sees a voltage of 4.92 volts or higher, it generates the SPN 1949 fault.
What a healthy reading looks like
EGR position sensor voltage should read between 0.5 to 4.5 volts.
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.
- 11. Check the EGR position sensor connector for signs of corrosion or damage. If damaged, repair or replace the connector.
- 22. Measure the voltage at the EGR position sensor while the engine is running. If it's over 4.92 volts, proceed to step 3; if it's within normal range, suspect a faulty ECM and test according to the manufacturer’s guidelines.
- 33. Inspect the wiring between the EGR sensor and the ECM for any shorts or open circuits. Fix any wiring issues found.
- 44. Replace the EGR position sensor if the previous steps are okay but the code persists.
Common causes
- Faulty EGR position sensor
- Wiring issue in the EGR circuit
- Short circuit to power in EGR sensor wiring
- Failed EGR control valve
- Open circuit in the EGR sensor wiring
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's safe to drive if the engine is running smoothly, but you may experience reduced fuel efficiency and emissions control.
Will this code come back after clearing it?
If the underlying issue isn’t fixed, yes, it will likely return.
Why does this code pair with other SPNs?
Codes like SPN 1947 and 1948 relate to EGR system malfunctions and can indicate related issues affecting performance.
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