P1655 Power Steering Pressure Switch Circuit
The P1655 code indicates that the Power Steering Pressure (PSP) switch has reported a value outside the expected range during the PCM's self-test. This switch monitors hydraulic pressure in the power steering system and signals the PCM to adjust idle speed when steering effort increases engine load. The code sets when the electrical state of the PSP switch does not match the pre-established parameters during the self-test, typically at startup or under specific test conditions, suggesting a fault in the switch circuit such as failure to open or close properly.
01. Most Common Causes
- Faulty or damaged power steering pressure switch
- Short circuit or open circuit in the PSP switch wiring
- Corroded or loose electrical connections at the switch connector
- Low power steering system pressure due to a defective pump
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or stalling when turning the steering wheel at low speeds
03. Step-by-Step Diagnosis
Scan for codes and verify P1655 is present
Inspect the PSP switch connector for corrosion, damage, or loose pins
Test the PSP switch operation using a multimeter: check for continuity when steering is turned and no continuity when straight
Check power steering fluid level and condition; inspect for leaks
If switch and wiring are good, test power steering pump pressure output
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with a P1655 code, as it is low severity. However, you may experience rough idle or stalling when turning, so it's best to have it diagnosed and repaired soon.
How much does it cost to fix?▼
The cost to fix a P1655 code typically ranges from $100 to $300, depending on whether the switch needs replacement (part cost $20-$80) or if wiring repairs are needed. Labor is usually 1-2 hours.