A/C High Pressure Switch circuit voltage high
P1539 — A/C High Pressure Switch circuit voltage high
System: Powertrain | Type: Manufacturer-Specific | Make: GM
P1539 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.
When P1539 is stored, the module has detected a signal or supply voltage higher than the expected operating range.
Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.
P1539 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.
| Code | P1539 |
| System | Powertrain |
| Type | Manufacturer-Specific |
| Make | GM |
| Causes | — |
| Diag. Assistant | — |
| Video | — |
Get complete diagnostic info, causes, and repair guidance.
Start Free 7-Day Trial Member LoginSearch all 8,602 fault codes with complete diagnostic details, possible causes, and repair guidance.
Start Your Free 7-Day Trial Member Login© 2026 The Automotive Technician (TaT) — www.tat.net.au