What Does P07B7 Mean?
The transmission park position sensor/switch "A" circuit is exhibiting intermittent or erratic behavior. The TCM has detected that the sensor A signal fluctuates unpredictably, drops out momentarily, or produces unstable readings that do not correlate with actual transmission position changes. This is typically caused by loose connections, damaged wiring, or a failing sensor with worn internal contacts. The vehicle may intermittently refuse to start, display wrong gear indicators, or have sporadic shift interlock issues.
Common Causes
35%
Loose or corroded connector at park position sensor A causing intermittent signal loss
25%
Failing park position sensor A with worn internal contacts or resistive element
20%
Chafed or broken wire strand in the sensor circuit creating intermittent open/short
10%
Corroded TCM connector terminals causing intermittent signal reading
10%
Electromagnetic interference from nearby components affecting sensor signal
Diagnostic Steps
1
Perform a connector wiggle test at the park position sensor A while monitoring the signal voltage on the scan tool — look for signal dropouts or spikes.
2
Inspect sensor A connector pins for signs of corrosion, spread terminals, or moisture intrusion that would cause intermittent contact.
3
Check the wiring harness from sensor A to the TCM for chafed insulation, pinched wires, or areas where vibration could cause intermittent breaks.
4
Monitor sensor A signal voltage over an extended drive cycle to capture the intermittent condition and correlate it with vehicle operating conditions.
5
If wiring and connectors check good, replace the park position sensor A — worn internal contacts are a common cause of erratic behavior.
Estimated Repair Cost
$120 - $500
Parts + labor, varies by vehicle and location
The transmission park position sensor/switch "A" circuit is exhibiting intermittent or erratic behavior. The TCM has detected that the sensor A signal fluctuates unpredictably, drops out momentarily, or produces unstable readings that do not correlate with actual transmission position changes. This ...
The most common cause of P07B7 (Transmission Park Position Sensor/Switch "A" Circuit Intermittent/Erratic) is: Loose or corroded connector at park position sensor A causing intermittent signal loss
Typical repair costs for P07B7 range from $120 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent sensor failures can cause unpredictable behavior — the vehicle may occasionally refuse to start, display wrong gear positions, or have shift interlock problems. Always use the parking brake. Have this diagnosed and repaired soon to prevent being stranded.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07B7 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control / Park System
Difficulty
Type
Generic (SAE)
Recommended Tools
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