P2805 — Transmission Range Sensor "A"/"B" Correlation

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P2805 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the automatic transmission control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
  5. Subsystem check Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2805 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2805 (parts and labor, USD, independent shop rates): Transmission rebuild or replacement: $2,500–$5,500; Valve body repair or replacement: $700–$1,500; Transmission fluid service: $150–$350; Replace a shift solenoid: $300–$800. Overall, fixing P2805 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What is the most common cause of P2805?

The most common causes are: low or degraded transmission fluid, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.

How much does it cost to fix P2805?

Transmission rebuild or replacement — $2,500–$5,500; Valve body repair or replacement — $700–$1,500; Transmission fluid service — $150–$350; Replace a shift solenoid — $300–$800. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose P2805 myself?

Start with a scan: confirm P2805, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the automatic transmission control, and verify the suspect component against live data before buying parts.

What are the symptoms of P2805?

Drivers most often notice: Check Engine or transmission warning light on, transmission stuck in one gear (limp mode), shuddering at highway speed, harsh or delayed shifting.

What does OBD2 code P2805 mean?

Transmission Range Sensor "A"/"B" Correlation (P2805): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by low or degraded transmission fluid, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.

What does P2805 mean?

When P2805 appears on a scan, it means the control module has flagged a problem in the automatic transmission control: transmission range sensor "A"/"B" correlation. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2805 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P2805?

  • internal mechanical wear (clutches, torque converter)
  • valve body wear
  • faulty transmission speed sensor
  • wiring or connector faults in the valve body harness
  • low or degraded transmission fluid
  • failed shift or pressure control solenoid

Common symptoms of P2805

  • Check Engine or transmission warning light on
  • transmission stuck in one gear (limp mode)
  • shuddering at highway speed
  • harsh or delayed shifting
  • slipping between gears
  • no movement in severe cases

How to diagnose P2805

  1. Connect an OBD2 scanner, confirm P2805 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the automatic transmission control for damage, corrosion, chafing or poor contact.
  4. Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
  5. Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2805 does not return.

How to fix P2805

Start with the cheapest and most common causes before replacing expensive parts:

  • Transmission rebuild or replacement — $2,500–$5,500
  • Valve body repair or replacement — $700–$1,500
  • Transmission fluid service — $150–$350
  • Replace a shift solenoid — $300–$800

How much does it cost to fix P2805?

Repair cost depends on which component actually failed. Typical scenarios for P2805 (parts and labor, USD, independent shop rates):

  • Transmission rebuild or replacement: $2,500–$5,500
  • Valve body repair or replacement: $700–$1,500
  • Transmission fluid service: $150–$350
  • Replace a shift solenoid: $300–$800

Overall, fixing P2805 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2805?

Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

Related OBD2 codes