Code
P07B5
Generic
P — Powertrain
Transmission Park Position Sensor/Switch A Circuit Performance/Low
Views:
UK: 29
EN: 41
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or short in park position sensor wiring (signal/return/reference)
- Corroded, loose or damaged connector at the sensor or PCM
- Faulty park position sensor / switch A
- Poor or missing ground or reference voltage to the sensor
- Mechanically misaligned or stuck park switch / detent assembly
- Water intrusion or contamination in connector or sensor
Symptoms
- Malfunction Indicator Lamp (MIL)/Check Engine lamp illuminated
- Vehicle may not crank or start (safety interlock prevents starter)
- Incorrect gear/PRNDL indicator or no Park indication
- Shift interlock (park-to-shift) problems
- Transmission may go into a limp or default mode
- Possible inability to remove key or engage park pawl
What to check
- Retrieve freeze frame and live data with a scan tool; note park position and related PID values
- Visually inspect harness and connector for damage, corrosion or moisture at sensor and PCM
- Backprobe sensor connector to verify reference voltage (typically ~5 V) and ground presence with ignition on
- Measure signal voltage at sensor connector while selecting Park and other gears
- Check continuity and resistance between sensor signal/ground pins and PCM pins (ignition off)
- Wiggle test wiring while observing scan tool data for intermittent changes
Signal parameters
- Reference voltage: commonly ~5 V (verify vehicle specification)
- Signal voltage: expected to change between ~0 V and ~4–5 V depending on design; 'low' typically ~0–0.5 V
- Resistance: sensor/switch may be near 0 Ω (closed) or open/infinite when open circuit—refer to vehicle spec
- Continuity: low resistance between sensor ground and chassis ground (< 1–2 Ω); verify per vehicle spec
Diagnostic algorithm
- Read and record freeze frame and all transmission/PRNDL related PIDs. Note when code set and vehicle status.
- Visually inspect sensor connector and wiring for damage, corrosion, pin pushes, or water intrusion. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (usually ~5 V) and good ground.
- Measure the signal wire voltage while selecting Park and other gears. Confirm whether the signal goes to the expected level in Park.
- If signal is low or stuck at 0 V, check continuity from signal pin to PCM pin for short to ground or open. Repair any shorts/opens.
- If wiring and connectors are good but signal still incorrect, replace the park position sensor/switch assembly and retest.
- After repairs, clear codes, cycle ignition and perform a functional test: confirm proper signal transitions with gear selector and verify vehicle starts/indicates Park correctly.
- If the fault returns and wiring/sensor are verified, suspect PCM fault or require advanced diagnostics/software—consult manufacturer data.
Likely causes
- Damaged/frayed wiring or pin pushed out of connector
- Corroded or bent connector pins at sensor or PCM
- Failed park position switch (sensor) assembly
- Short to ground on the signal circuit (results in low voltage)
- Mechanical linkage not properly seated causing the switch not to engage
Fault status
Status
Transmission Park Position Sensor/Switch A Circuit Performance/Low (P07B5)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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