P0789 moderate

Pressure Control Solenoid F Performance/Stuck Off

The P0789 code means the vehicle's onboard diagnostic system has detected: Pressure Control Solenoid F Performance/Stuck Off. This is a moderate severity code.

My Garage →

Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $150 - $1,200 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Common Symptoms

Check Engine Light on
Transmission pressure control F not functioning
Shift quality degradation
Transmission may enter limp mode

Probable Causes (Ranked by Likelihood)

Pressure control solenoid F stuck in off position Very High
Contaminated or degraded transmission fluid High
Wiring or connector fault in the circuit Moderate
TCM internal circuit failure Low

Step-by-Step Diagnostic Procedure

Use a scan tool to monitor Pressure Control Solenoid F Performance data
Check transmission fluid level and condition
Inspect the transmission wiring harness and connector for damage or corrosion
Compare sensor readings to manufacturer specifications at various operating conditions

Frequently Asked Questions

What does P0789 indicate?

P0789 indicates a problem with the pressure control solenoid f performance/stuck off. This affects the transmission control module's ability to properly manage shift timing and quality.

Should I continue driving with this code?

You can drive short distances at reduced speeds, but the transmission may shift harshly or enter limp mode. Continued driving with transmission codes can lead to additional damage and more expensive repairs.

Is this an internal transmission problem?

Not necessarily. Many transmission codes are caused by external issues like wiring faults, sensor failures, or fluid condition. Proper diagnosis can often identify issues that can be repaired without opening the transmission.