Hello I am very new here, I have a 2004 grand voyager and it's started to do strange things. It's started by when driving along it would slip back into 2nd gear revs would shoot right up then kicks back in again. Now when driving along revs go up again then feels like I am fighting against my brakes as revs r up but no power. Had it into a garage and they gave me a code reading p0884 meaning no power to the ecu but don't seem to b ale to find solution to my problem. We have changed battery as old one was on way out we have also checked wires around battery and plugs. Need help to solve this ASAP

 

U will need a wire diagram and trace down the power and grounds to that circuit

 

Where do I locate the tcm and where do I get a wire diagram??

 

your o4 the tcm and pcm are one unit and u can get a wire diagram from the service manual or buy a subscription online to a place.

 

What wire are we looking for as there are 2 different sets of wires

 

P0884-POWER UP AT SPEED
When Monitored: When the Transmission Control Module initially powers up. Note: the
Transmission Control Module is integrated with Powertrain Control Module. The Transmission
Control Module has separate powers and grounds specifically to its portion of the
PCM.
Set Condition: This DTC will set if the TCM powers up and senses the vehicle in a valid
forward gear (no PRNDL DTCs) with a output speed above 800 RPM (approximately
32Km/h or 20 MPH).
POSSIBLE CAUSES
P0884 POWER UP AT SPEED
TEST ACTION APPLICABILITY
1 This DTC is set when the PCM is initialized while the vehicle is moving down the
road in a valid forward gear. This is usually a momentarily loss of power to the
Transmission portion of the PCM.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS
RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
NOTE: Due to the integration of the Powertrain and Transmission Control
Modules, the transmission part of the PCM has its own specific power and
ground circuits.
Check all of the Fused B+, Fused Ignition Switch Output, and Ground circuits
related to the PCM for an intermittent open or short to ground.
Perform a wiggle test on all wiring and connectors pertaining to the PCM while
looking for shorts and open circuits.
With the DRBIIIt, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
.

 

I showed my partner what you said and he was a bit unsure even thou he is a mechanic, electrics just seem to throw him a bit. He has scanned the top to see if he could find the wires he is looking for and noticed a clicking sound when the ignition was on. Not sure of what he is looking at he is now hoping a auto electrician will take it on as so far we have had no luck. I shall give this information you have given me to a auto electrican and then see if they will take it on as although my partner would love to b able to fix it he is just worried he wil make it worse.

 

Hi update on my car is no one seems to b able to find a fault with my car, it was stripped and all wires checked and all cleaned and now my car is stuck in 3rd gear and I have no speedo and I don't know which gear it's in I.e drive, reverse, park. Do u have any other ideas wot it could b????

 

take it to a transmission shop or dealer they can find out whats wrong

 

Quick question we got told tcm is on top but now been told its behind the lights can u just clear up where abouts it is please? Sorry for sounding dumb but trying to save money by not taking it to a dealer as they charge 100s just to look at it