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Home / DTC / P07BC — Transmission Park Position Sensor/Switch B Circuit Performance High

P07BC — Transmission Park Position Sensor/Switch B Circuit Performance High

Detailed page for trouble code P07BC.

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Code

P07BC

Generic P — Powertrain

Transmission Park Position Sensor/Switch B Circuit Performance High

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 21 RU: 13
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Page language: EN

Causes

  • Open or shorted wiring in the Park Switch B circuit (short to battery voltage)
  • Corroded, loose, or damaged connector at the transmission Park switch
  • Failed Park position sensor/switch B (internal short or stuck contact)
  • Poor or missing ground for the transmission control module or sensor circuit
  • Water or contamination intrusion into the switch/connector
  • Intermittent wiring harness damage (pinched, chafed, broken)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated with P07BC stored
  • Transmission may not shift correctly or may stay in limp/backup mode
  • Incorrect gear indicator on dash (e.g., not showing P when actually in Park)
  • Engine may not start if the PCM/TCM does not see Park/Neutral input (no crank)
  • Intermittent no‑crank or no‑start when vehicle appears in Park

What to check

  • Retrieve freeze frame and live data with a scan tool; note Park switch B status and compare to Park switch A (if available)
  • Visually inspect connector and wiring at the transmission Park switch for corrosion, damage, or fluid contamination
  • Verify vehicle battery voltage is stable (13.0–14.5 V with engine running) to rule out supply issues
  • Check for proper reference voltage and ground at the PCM/TCM and at the Park switch connector
  • Perform backprobe of the Park switch B signal with a multimeter or scope while moving shifter through positions
  • Wiggle testing of the harness while monitoring the signal to reproduce an intermittent fault

Signal parameters

  • Reference supply: typically 5 V (pull‑up inside PCM/TCM) — confirm vehicle service info
  • Expected Park switch B signal: ~0.0–0.5 V when switch is pulled to ground (closed), ~4.0–5.0 V when open (pulled up)
  • Open circuit: high reading (near reference/5 V) or OL on resistance check
  • Short to battery voltage: ~12 V on signal (indicates wiring short to VB)
  • Closed switch resistance: near 0 ohms (a few ohms) between signal and ground terminal; open is high/infinite

Diagnostic algorithm

  1. Read and record DTCs, freeze frame, and live data. Confirm P07BC and note any other transmission or PRNDL codes.
  2. Perform a visual inspection of the Park switch B connector and wiring at the transmission. Look for corrosion, bent pins, contamination, or physical damage.
  3. With ignition ON (engine off), backprobe the Park switch B signal, measure voltage to ground. Compare actual voltage to expected (approx. 0–0.5 V closed, 4–5 V open). Operate shifter to observe signal change.
  4. If signal is higher than expected (performance high), check for short to battery (measure voltage against battery). Inspect harness areas for chafing where it could contact VB.
  5. Check continuity/resistance from the Park switch connector to the PCM/TCM input pin. Repair any open circuits or high resistance connections.
  6. Inspect and test reference power and ground for the PCM/TCM. A missing ground or incorrect reference can create abnormal high reads.
  7. If wiring and connectors test good, test or replace the Park position switch B. Many switches are inexpensive and can be bench‑tested for open/closed behavior as gear selector moves.
  8. After repairs, clear codes and perform road/shift tests while monitoring live data to ensure the switch changes state correctly and the code does not return.
  9. If problem persists after confirming good switch and wiring, consult manufacturer service information for PCM/TCM diagnostics and consider module testing/reprogramming.

Likely causes

  • Connector pins corroded or pushed out at the transmission Park switch harness
  • Wiring shorted to battery voltage (VB) or constant 12V on the switch signal circuit
  • Open circuit between Park switch B and the PCM/TCM leading to a pull‑up reading high
  • Failed Park position switch (internal contact welded or shorted)
  • Damaged insulation where harness rubs on frame or bellhousing

Fault status

⚠️ Status
Transmission Park Position Sensor/Switch B Circuit Performance High — the control module detects Park switch B signal above expected range or inconsistent with expected park/neutral input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0705 P0706 P0707 P0708 P0709 P0701
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