What Does P1907 Mean?
The transmission control module has detected an open circuit or short to ground in the kickdown hold relay control circuit. This relay maintains lower gears during aggressive driving, and the fault prevents the relay from being properly controlled.
Common Causes
35%
Faulty kickdown hold relay with internal failure
30%
Damaged or shorted relay control circuit wiring
20%
Corroded or damaged relay socket connections
10%
Blown fuse in relay power supply circuit
5%
Transmission control module output driver failure
Diagnostic Steps
1
Step 1: Locate and remove kickdown hold relay from fuse/relay box
2
Step 2: Inspect relay socket for corrosion, damage, or poor terminal contact
3
Step 3: Verify fuse integrity and power supply voltage at relay socket
4
Step 4: Bench test relay by energizing coil and verifying contact closure
5
Step 5: Test control wire continuity from TCM to relay socket and check for shorts to ground; replace relay if circuits test good
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The transmission control module has detected an open circuit or short to ground in the kickdown hold relay control circuit. This relay maintains lower gears during aggressive driving, and the fault prevents the relay from being properly controlled.
The most common cause of P1907 (Kickdown Hold Relay Open or Short Circuit to Ground) is: Faulty kickdown hold relay with internal failure
Typical repair costs for P1907 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may upshift too early during acceleration, reducing performance and engine braking. Vehicle is safe to drive but may feel less responsive and have reduced towing/passing ability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1907 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Shift Control
Difficulty
Type
Manufacturer
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