What Does P1912 Mean?
The kickdown hold relay circuit has an open circuit or short to ground condition. This relay maintains the kickdown function during extended acceleration, and circuit faults affect downshift performance.
Common Causes
35%
Failed kickdown hold relay with open coil or contact failure
25%
Corroded or loose relay connector or socket
20%
Damaged wiring harness between TCM and relay location
15%
Blown fuse protecting kickdown hold relay circuit
5%
TCM output driver malfunction
Diagnostic Steps
1
Step 1: Locate kickdown hold relay and inspect for damage, corrosion, or signs of overheating
2
Step 2: Measure relay coil resistance and test contact operation; replace if out of specification
3
Step 3: Check fuse and power supply voltage at relay; verify proper ground connection
4
Step 4: Test continuity of control wire from TCM to relay; check for shorts to ground along harness routing
5
Step 5: Command relay operation with scan tool and verify voltage changes at relay terminals
Estimated Repair Cost
$80 - $300
Parts + labor, varies by vehicle and location
The kickdown hold relay circuit has an open circuit or short to ground condition. This relay maintains the kickdown function during extended acceleration, and circuit faults affect downshift performance.
The most common cause of P1912 (Kickdown Hold Relay Open or Short Circuit to Ground) is: Failed kickdown hold relay with open coil or contact failure
Typical repair costs for P1912 range from $80 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced kickdown performance limits acceleration capability and passing power. Vehicle remains drivable but with diminished performance in demanding situations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1912 to identify the root cause.
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Quick Info
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Powertrain
System
Automatic Transmission
Difficulty
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