What Does P07BD Mean?
The transmission park position sensor/switch "B" circuit is exhibiting intermittent or erratic behavior. The TCM has detected that sensor B's signal fluctuates unpredictably, produces momentary dropouts, or generates unstable readings that do not correspond to actual transmission position changes. This intermittent fault is typically caused by loose connections, worn sensor contacts, damaged wiring, or electromagnetic interference. The redundant Park verification system is compromised when sensor B behaves erratically.
Common Causes
35%
Loose or corroded connector at park position sensor B causing intermittent contact
25%
Failing park position sensor B with worn internal contacts producing erratic output
20%
Chafed or partially broken wire in sensor B circuit creating intermittent open or short
10%
Corroded TCM connector terminals affecting sensor B signal path
10%
Electromagnetic interference from adjacent wiring or components affecting signal integrity
Diagnostic Steps
1
Perform a wiggle test at the sensor B connector while monitoring signal voltage on the scan tool — watch for spikes, dropouts, or erratic fluctuations.
2
Inspect sensor B connector pins for corrosion, spread terminals, moisture, or debris that would cause intermittent contact.
3
Check the wiring harness from sensor B to the TCM for chafed insulation, pinched wires, or areas subject to vibration damage.
4
Monitor sensor B signal over an extended drive cycle to capture the intermittent condition and identify triggering conditions.
5
If wiring and connectors are in good condition, replace sensor B — worn internal contacts are a common source of erratic signals.
Estimated Repair Cost
$120 - $500
Parts + labor, varies by vehicle and location
The transmission park position sensor/switch "B" circuit is exhibiting intermittent or erratic behavior. The TCM has detected that sensor B's signal fluctuates unpredictably, produces momentary dropouts, or generates unstable readings that do not correspond to actual transmission position changes. T...
The most common cause of P07BD (Transmission Park Position Sensor/Switch "B" Circuit Intermittent/Erratic) is: Loose or corroded connector at park position sensor B causing intermittent contact
Typical repair costs for P07BD range from $120 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent sensor B faults reduce the reliability of Park position verification. The vehicle may occasionally display wrong gear, refuse to start, or have shift interlock issues. Always use the parking brake. Diagnose and repair promptly to restore full system redundancy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07BD to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control / Park System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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