What Does P1702 Mean?
The transmission range sensor (gear position sensor) signal is intermittently dropping out or providing inconsistent data to the transmission control module. This prevents reliable detection of gear selector position.
Common Causes
35%
Worn or loose transmission range sensor (PRNDL sensor)
30%
Corroded or loose electrical connector at range sensor
20%
Damaged wiring harness or intermittent short/open in sensor circuit
10%
Worn shift linkage causing misalignment of range sensor
5%
Internal TCM circuit intermittent failure
Diagnostic Steps
1
Step 1: Locate transmission range sensor and wiggle connector while monitoring live data for signal dropout
2
Step 2: Inspect connector for corrosion, bent pins, or moisture; clean and secure if needed
3
Step 3: Check sensor adjustment/alignment on transmission and verify proper shift linkage operation
4
Step 4: Measure sensor voltage at each gear position (should show distinct voltage steps)
5
Step 5: Monitor sensor signal during vehicle movement and temperature changes to identify intermittent condition
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The transmission range sensor (gear position sensor) signal is intermittently dropping out or providing inconsistent data to the transmission control module. This prevents reliable detection of gear selector position.
The most common cause of P1702 (Transmission Range Sensor Circuit Intermittent) is: Worn or loose transmission range sensor (PRNDL sensor)
Typical repair costs for P1702 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause no-start conditions, inability to shift out of park, or incorrect gear display. Vehicle may enter limp mode unexpectedly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1702 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Gear Selection
Difficulty
Type
Manufacturer
Recommended Tools
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