Redundant Pressure Sensor Failure
Indicates a failure in the redundant pressure sensor system.
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 vehicle has two pressure sensors for safety, and one is malfunctioning, which may lead to incorrect readings about system pressure.
What the computer is actually seeing
The ECM detects a discrepancy between the primary and secondary pressure sensor readings, indicating that one of the sensors is out of range or not responding correctly.
What a healthy reading looks like
Primary and secondary pressure readings should match within 5 PSI of each other.
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 wiring and connectors for the redundant pressure sensors for damage or corrosion.
- 2Measure the resistance of the sensors and confirm they are within manufacturer specifications (typically between 5-10 ohms).
- 3Compare the voltage outputs of both sensors while the engine is running (should be within 5 volts of each other).
- 4Inspect pressure readings using a scan tool; if only one sensor fails, replace that sensor. If both fail, investigate further into wiring or ECM faults.
Common causes
- Faulty redundant pressure sensor
- Wiring or connection issues between the sensors and ECM
- Corroded connections
- ECM calibration issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive, but you should address it soon to avoid potential system failure.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, it will likely return.
Why does this code sometimes pair with SPN 1868?
SPN 1868 indicates a similar issue with another pressure sensor, often seen together in the redundant system.
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