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P1847

2-3 Shift Solenoid Circuit High Voltage.

  • Oldsmobile
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
8
AreaTransmission
47
FaultThe specific fault in that area

What it means

P1847 on an Oldsmobile means the transmission control module has detected a high voltage condition in the 2-3 shift solenoid circuit. The module monitors the circuit when it commands the solenoid on and off, and it sets the code when the voltage it sees does not match the commanded state, which points to an open circuit, a short to voltage or a failed solenoid. The exact solenoid location and wiring layout depend on the model and transmission fitted.

Symptoms

  • Transmission warning light or check engine light on
  • Harsh, delayed or missing 2-3 upshift
  • Transmission stuck in one gear, often limp mode
  • Poor acceleration or high revs at cruising speed
  • Poor fuel economy
  • Gear selection feels erratic or changes unexpectedly

Possible causes

  • Faulty 2-3 shift solenoid (open or shorted internally)likely
  • Damaged, chafed or corroded wiring between the solenoid and the control modulelikely
  • Poor connection or corrosion at the transmission internal harness connector or case pass-through connectorlikely
  • Contaminated or degraded transmission fluid affecting solenoid operation and electrical connectionspossible
  • Low or unstable battery or charging system voltagepossible
  • Faulty transmission control module or its driver circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, and note whether any other transmission or power supply codes are present
  2. Check battery condition and charging voltage, as low or erratic voltage can upset solenoid readings
  3. Check the transmission fluid level and condition, looking for burnt smell, debris or metallic contamination
  4. Visually inspect the external wiring and connector at the transmission for chafing, heat damage, water ingress and bent or corroded pins
  5. Measure the solenoid resistance at the connector and compare it with the manufacturer specification for that transmission
  6. Check the circuit for continuity, short to voltage and short to earth between the solenoid connector and the control module, following the wiring diagram for the model
  7. Command the solenoid with a suitable scan tool and watch the circuit voltage change, if the tool supports it
  8. Once the wiring and solenoid are proven good, check the module power, earth and driver circuit before suspecting the module

How to fix

  • Replace the 2-3 shift solenoid if its resistance or operation is out of specification
  • Repair or replace damaged wiring and clean or replace corroded connectors
  • Replace the internal transmission harness or case connector if it is faulty or leaking fluid
  • Change the transmission fluid and filter if it is contaminated, and repair any underlying wear found
  • Repair battery or charging faults to restore stable supply voltage
  • Repair or replace the control module only after all other causes are ruled out, and have it programmed as required

Can I keep driving?

Medium severity

The car can usually be driven carefully a short distance, but the transmission may be in limp mode with harsh or missing shifts. Get it checked soon, as continued driving can cause extra transmission wear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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