Suction Pressure Sensor Out of Range
The suction pressure sensor reading is outside the expected limits.
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What it means (plain English)
The engine's computer is getting a reading from the suction pressure sensor that’s either too high or too low compared to what it should be, which could be caused by multiple issues in the system.
What the computer is actually seeing
The ECM (Engine Control Module) detects a suction pressure sensor signal that falls outside of the pre-defined acceptable range, typically below 0.5V or above 4.5V in a 5V reference system.
What a healthy reading looks like
Suction pressure should range between 0 and 5V as read by the sensor. A normal reading should be around 2.5V at atmospheric pressure.
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 condition of the wiring and connectors at the suction pressure sensor. Look for corrosion, damage, or loose connections.
- 2Measure the voltage at the suction pressure sensor connector with the key on (engine off). Expected voltage should be between 0.5V to 4.5V. If out of range, continue to step 3.
- 3Confirm the sensor is receiving a good 5V reference signal from the ECM. If not, trace the wiring back to the ECM.
- 4If wiring and signal are good, replace the suction pressure sensor and clear the fault code before retesting the system.
Common causes
- Faulty suction pressure sensor
- Wiring issues (shorts/open circuits)
- Improper system refrigerant levels
- Faulty ECM (rare)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the A/C system may not function correctly and you risk further damage if the underlying issue isn't resolved.
Will this problem come back after I fix it?
If other conditions like wiring issues or low refrigerant aren't addressed, the code might reappear.
Why does this code pair with SPN 6144?
SPN 6144 relates to the high-pressure side of the system, both sensors help diagnose A/C system performance.
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