Fault code lookup

PowertrainP0816

Caution

Severity: Caution - get it checked when you can

Downshift Switch Circuit

30 brands affected · Generic SAE J2012 description.

Key terms: SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This range normally covers the transmission control system, but some manufacturers use P07-P09 codes for unrelated functions (fuel pump control, air-mix motors, lighting or windows). Check the description before assuming it is a transmission fault.

2Common causes

  1. Low or dirty transmission fluid
  2. Faulty shift solenoid
  3. Faulty speed sensor
  4. Wiring or connector fault
  5. Internal transmission wear

3Can I drive?

Caution · drive with care

If the transmission slips, jerks, will not shift, or a transmission temperature warning is on, stop driving and let it cool: continuing can cause expensive damage. If the code names a different system (for example the fuel pump), treat it on its own terms; a fuel-pump control failure can stall the car, so have it checked before driving further. Otherwise drive gently to a workshop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 30

BrandCodeDescriptionSystem
Ashok Leyland CVP0816Downshift Switch Circuit SAEPowertrain
BAIC MotorP0816Downshift Switch Circuit BrandPowertrain
Mercedes-BenzP0816Downshift Switch Circuit SAEPowertrain
BMWP0816ownshift Switch Circuit BrandPowertrain
BYDP0816Downshift Switch Circuit BrandPowertrain
CheryP0816Downshift Switch Circuit BrandPowertrain
DaewooP0816Downshift Switch Circuit BrandPowertrain
DFFSP0816Downshift Switch Circuit BrandPowertrain
DFFXP0816Downshift Switch Circuit BrandPowertrain
DFXKP0816Downshift Switch Circuit BrandPowertrain
EOBDP0816Alennuskytkimen piiri BrandPowertrain
GeelyP0816Downshift Switch Circuit BrandPowertrain
GMP0816Downshift Switch Circuit BrandPowertrain
Great WallP0816Downshift Switch Circuit BrandPowertrain
HafeiP0816Downshift Switch Circuit BrandPowertrain
HoldenP0816Downshift Switch Circuit BrandPowertrain
HondaP0816Downshift Switch Circuit SAEPowertrain
HyundaiP0816Downshift Switch Circuit SAEPowertrain
IsuzuP0816Downshift Switch Circuit SAEPowertrain
Land RoverP0816Down switch circuit fault BrandPowertrain
MaseratiP0816Downshift Switch-Stuck BrandPowertrain
MitsubishiP0816Paddle shift SW BrandPowertrain
OpelP0816Downshift Switch Circuit BrandPowertrain
PeugeotP0816Downshift Switch Circuit SAEPowertrain
ProtonP0816Paddle shift SW BrandPowertrain
SaabP0816Downshift Switch Circuit BrandPowertrain
MG (SAIC)P0816Downshift Switch Circuit BrandPowertrain
SubaruP0816Downshift Switch Circuit SAEPowertrain
TataP0816Downshift Switch Circuit BrandPowertrain
ToyotaP0816Downshift switch circuit BrandPowertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

  • P0810 Clutch Position Control Error
  • P0811 Excessive Clutch A Slippage
  • P0812 Reverse Input Circuit
  • P0813 Reverse Output Circuit
  • P0814 Transmission Range Display Circuit
  • P0815 Upshift Switch Circuit
  • P0817 Starter Disable Circuit/Open
  • P0818 Driveline Disconnect Switch Input Circuit
  • P0819 Up and Down Shift Switch to Transmission Range Correlation
  • P081A Starter Disable Circuit Low
  • P081B Start lock: circuit short to battery (+)
  • P081C Park Input Circuit

Browse Pxxx codes or P081xx codes.

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