What Does P1908 Mean?
The transmission control module has detected either an open circuit or short to ground in a transmission pressure control solenoid circuit. This is a general pressure solenoid fault that affects hydraulic pressure regulation critical for proper clutch and gear engagement.
Common Causes
40%
Failed transmission pressure control solenoid with internal short or open
30%
Damaged transmission wiring harness with open or short circuit
20%
Corroded or damaged solenoid electrical connector
7%
Low transmission fluid causing solenoid overheating and failure
3%
Transmission control module driver circuit failure
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition; top off or replace if necessary
2
Step 2: Locate and disconnect the pressure control solenoid connector; inspect for corrosion or damage
3
Step 3: Measure solenoid resistance (typically 3-30 ohms) and check for shorts to ground or opens
4
Step 4: Inspect transmission wiring harness for damage, particularly where it enters the transmission case
5
Step 5: If resistance is out of specification or harness is damaged, replace affected components; clear codes and retest
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The transmission control module has detected either an open circuit or short to ground in a transmission pressure control solenoid circuit. This is a general pressure solenoid fault that affects hydraulic pressure regulation critical for proper clutch and gear engagement.
The most common cause of P1908 (Transmission Pressure Circuit Solenoid Open or Short to Ground) is: Failed transmission pressure control solenoid with internal short or open
Typical repair costs for P1908 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause severe shifting problems including harsh shifts, no shifts, slipping, or transmission stuck in one gear. Continued driving may cause significant transmission damage; limit operation until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1908 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Hydraulic Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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