[gstsaver]

From time to time I get 3 codes come up all at once:

• O2 sensors (2 codes for this)
• Then either Generator F or Coolant temperature sensor (never seems to be both just one or the other)

I assume it must be a bad common ground somewhere?

Any help would be appreciated.

 

[Rhotpursuit]

Year and engine?

 

[gstsaver]

2002 4x4 4.3l

 

[Recklessabandon]

What are the P codes?

 

[gstsaver]

What are the P codes?

Hi - the codes are P0128, P0135, P0155 are the codes. Is there a common ground for these?

 

[gstsaver]

Anyone know if this could be a common ground issue or is it more likely the PCM?

 

[oldeerslayer]

Most likely 2 separate problems. P0128 is ECT sensor, wiring, or thermostat stuck open.
P0135 and 155 are O2 sensor heater issues. Fuse in underhood fuse box, wiring or bad sensors.