P1907: Intermittent Short in Transmission Pressure Control Solenoid B
The powertrain control module (PCM) has detected an intermittent short circuit (to ground or voltage) in the transmission pressure control solenoid 'B' circuit. This solenoid regulates main line pressure for shift and clutch control. An intermittent fault indicates a momentary loss of electrical circuit integrity, which can cause erratic transmission behavior.
01. Most Common Causes
- Intermittent internal short in pressure control solenoid 'B'
- Chafed, pinched, or intermittently shorted wiring in solenoid 'B' circuit
- Loose, corroded, or damaged terminals at solenoid or PCM connectors
- Internal failure of the solenoid driver within the PCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or harsh shifting
- Transmission stuck in a single gear (limp mode)
- Delayed engagement or slipping
03. Step-by-Step Diagnosis
Scan for additional transmission-related codes and freeze frame data
Visually inspect wiring and connectors for damage, corrosion, or loose pins
Test solenoid resistance and compare to specifications
Check for intermittent shorts by wiggling harness while monitoring scan tool data
If wiring and solenoid are good, suspect PCM internal fault
1. Frequently Asked Questions
Is it safe to drive?▼
It is not recommended to drive with this code active. The intermittent short can cause sudden transmission failure or unsafe driving conditions. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the issue is a simple wiring repair, solenoid replacement ($150-$400), or PCM replacement ($500-$1000+).