P2812

Control SolenoidGControl Circuit/Open

P2812 is a generic OBD-II powertrain diagnostic trouble code: Control SolenoidGControl Circuit/Open. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P2812
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
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What P2812 means

P2812 is set by the transmission control module when there is a disagreement or correlation error between transmission range sensor signal A and transmission range sensor signal B. Modern automatic transmissions use multiple redundant range sensor signals or a multi-signal range switch to determine gear selector position (Park, Reverse, Neutral, Drive, etc.), and the TCM cross-checks these signals for consistency.

When sensor A and sensor B report different or incompatible gear selector positions simultaneously, the TCM cannot confidently determine the actual gear selector state and logs P2812. Depending on calibration, this may cause the transmission to default to a safe or neutral state, restrict available gears, or engage failsafe operation to prevent unintended movement.

Common causes include a faulty multi-function switch or transmission range switch, damaged wiring within the shifter assembly or transmission harness, or internal TCM issues. The repair approach should start with visual and electrical checks before replacing mechanical components.

Common causes

Most-frequently reported root causes when P2812 is logged.

  • 1
    Failed or worn transmission range switch (multi-function switch) with internally conflicting contacts.
  • 2
    Damaged or shorted wiring in the range sensor harness between the switch and TCM.
  • 3
    Corroded or loose connector at the transmission range switch.
  • 4
    Misadjusted transmission range switch (linkage or cable out of alignment).
  • 5
    Internal TCM fault affecting the input signal processing for range sensor channels.
  • 6
    Moisture ingress into the range switch connector causing signal cross-contamination.
  • 7
    Intermittent contact failure within a dual-signal range switch assembly.

Symptoms drivers notice

MIL and/or transmission warning lamp illuminated.
Incorrect gear position indicator on the instrument cluster.
Transmission defaulting to limp mode or restricted gear operation.
Engine starting in gears other than Park or Neutral.
Backup lights not activating correctly in Reverse.
Erratic or unexpected gear selector behavior.

How to diagnose P2812

A typical diagnostic flow when this code is present.

  1. 1
    Connect a scan tool and record all TCM DTCs and freeze frame data.
  2. 2
    View live data for transmission range sensor A and B signals while slowly moving the gear selector through all positions.
  3. 3
    Note any positions where the two signals disagree or produce unexpected values.
  4. 4
    Inspect the transmission range switch connector and wiring harness for corrosion, damage, or loose terminals.
  5. 5
    Check range switch adjustment per manufacturer specification if a linkage-type adjustment is provided.
  6. 6
    Measure signal voltages and continuity per the transmission wiring diagram to isolate a wiring or switch fault.
  7. 7
    Replace the transmission range switch if adjustment and wiring checks are satisfactory and sensor signals remain inconsistent.

Vehicles where we've handled P2812

Platforms in our catalogue with confirmed P2812 coverage.

BMW 530XD
2017
BMW X5
2018–2019
BMW 320D
2016
BMW 530XD 30D

Related powertrain codes

Frequently asked questions

Is P2812 dangerous?

It can be. If the TCM cannot verify gear selector position, the vehicle may start or move unexpectedly. Have the fault diagnosed promptly.

Can a range switch be adjusted to fix P2812?

On transmissions with adjustable linkage, misadjustment is a common cause and realignment may resolve the fault. Always check adjustment before replacing the switch.

Will P2812 cause the car to get stuck in one gear?

Depending on the TCM's failsafe logic, yes. Many TCMs will lock the transmission in a default gear when range sensor correlation fails to prevent unsafe operation.

Can P2812 be caused by aftermarket shift modifications?

Yes. Short-throw shifters, cable adjustments, or aftermarket selector assemblies that alter switch actuation timing or travel can cause correlation faults between sensor A and B signals.

Disabling P2812 in software

RaceTune can permanently disable P2812 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECUs with a P2812 disable in our catalogue

Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.

  • Bosch EDC17C50 verified 1 software version
  • Bosch EDC17C56 verified 1 software version
  • Bosch MD1CP002 verified 1 software version
  • Bosch MD1CS001 verified 1 software version

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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