What Does P0918 Mean?
The TCM has detected intermittent signal dropouts or erratic behavior in the gear shift position sensor circuit. The sensor signal sporadically goes out of range before returning to normal operation, indicating a loose connection, damaged wire with intermittent break, or sensor that fails under certain temperature or vibration conditions.
Common Causes
35%
Loose or corroded connector at gear shift position sensor
30%
Intermittent wire break in harness due to vibration fatigue
25%
Gear shift position sensor failing intermittently
10%
TCM connector pin intermittent contact
Diagnostic Steps
1
Step 1: Monitor the gear shift position sensor on a scan tool data graph while the vehicle is driven over rough roads or the engine is at operating temperature — capture the conditions that trigger the intermittent fault.
2
Step 2: With key on, wiggle the sensor connector and tap the sensor body while monitoring signal — any dropout or spike confirms a connection or sensor issue.
3
Step 3: Flex the harness along its entire routing while monitoring the signal for interruptions.
4
Step 4: Inspect both the sensor and TCM connectors for spread terminals, backed-out pins, or corrosion — repair or replace terminals as needed.
5
Step 5: If the connector and harness appear sound, replace the sensor as an intermittent internal failure — then clear codes and perform adaptation.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The TCM has detected intermittent signal dropouts or erratic behavior in the gear shift position sensor circuit. The sensor signal sporadically goes out of range before returning to normal operation, indicating a loose connection, damaged wire with intermittent break, or sensor that fails under cert...
The most common cause of P0918 (Gear Shift Position Circuit Intermittent) is: Loose or corroded connector at gear shift position sensor
Typical repair costs for P0918 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent position signal loss can cause momentary shift hesitation, missed shifts, or harsh gear engagement. Drive cautiously at low speeds and schedule prompt repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0918 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automated Manual Transmission (Shift Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
