Hummer OBD2 codes
Codes where we have reviewed, vehicle-specific evidence for this make.
Hummer notes cover the H3 and H2: one bulletin lists P0030 with a reduced-power message on the 2006 H3 and points to the powertrain relay, and a GM bulletin ties P2723 with slipping in reverse or third on 2006 to 2009 H2 trucks to the housing and pump seal rings. Only bulletin summaries were read, so confirm the fix with a dealer.
P0030 with reduced power, 2006 H3
Hummer bulletin 3508C covers a service engine soon light and a reduced power message with several codes including P0030 on the 2006 H3. It says to inspect the powertrain relay operation. We only read the NHTSA summary. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.
P0036 with wiring chafed on the A/C hose coupling
GM bulletin PIT5336 lists P0036 among oxygen sensor heater and sensor codes on the 2013 to 2015 Enclave, Traverse and Acadia. It points to engine harness wires to the bank 1 oxygen sensor that are chafed on the A/C hose coupling, and to a possible open Emission 1 fuse. Related GM summaries for some older models mention the powertrain relay, or give no repair at all, and those older entries need testing to confirm. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.
P2723 with slipping in reverse or third
GM bulletin 09-07-30-004F covers slipping in reverse or third gear and delayed reverse or drive engagement on 2006 to 2009 six-speed models, with P2723 among the codes stored. It says to inspect the 1-2-3-4 and 3-5-R housing and the pump seal rings first. Check the fluid level and condition before that. We only read the NHTSA summary, not the bulletin itself. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.
P0030: Oxygen sensor heater circuit fault on bank 1 sensor 1
- H3 2006 · Supported by vehicle data · 1 bulletin
P0036: A fault in the heater control circuit of the downstream oxygen sensor on bank 1
- H3 2006 · Supported by vehicle data · 1 bulletin
P2723: Pressure control solenoid E stuck off or performing poorly
- H2 2006–2009 · Supported by vehicle data · 1 bulletin
Sources and review
- Hummer 3508C, SES light and reduced power with P0030 and others, H3
- GM PIT5336: MIL on with O2 sensor codes including P0036, wiring chafed on the A/C hose coupling
- TSB 09-07-30-004F: Slips in reverse or third, delayed engagement, DTCs P0776, P2715, P2723
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
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