What Does P1906 Mean?
The transmission control module has detected either an open circuit or a short to ground in the kickdown pull relay control circuit. The kickdown relay forces downshifts during heavy acceleration, and this fault prevents proper relay activation.
Common Causes
35%
Faulty kickdown pull relay with internal open or short
30%
Damaged relay control wiring or short to ground
20%
Corroded relay socket or poor electrical connection
10%
Blown fuse in kickdown relay power supply circuit
5%
Transmission control module relay driver circuit failure
Diagnostic Steps
1
Step 1: Locate kickdown pull relay in fuse/relay box and remove for inspection
2
Step 2: Inspect relay socket terminals for corrosion, damage, or bent pins
3
Step 3: Check fuse for kickdown relay circuit and verify power supply to relay socket
4
Step 4: Test relay operation by applying 12V to coil terminals and checking continuity across switch contacts
5
Step 5: Check relay control wire from TCM to relay socket for opens or shorts to ground; replace relay if wiring is good
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The transmission control module has detected either an open circuit or a short to ground in the kickdown pull relay control circuit. The kickdown relay forces downshifts during heavy acceleration, and this fault prevents proper relay activation.
The most common cause of P1906 (Kickdown Pull Relay Open or Short Circuit to Ground) is: Faulty kickdown pull relay with internal open or short
Typical repair costs for P1906 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Kickdown function during hard acceleration may not work, resulting in sluggish performance when passing or merging. Vehicle remains safe to drive but with reduced performance capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1906 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Shift Control
Difficulty
Type
Manufacturer
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