I tried starting this morning my x-type to find out that it cranks over but won't start, gives me trany fault and pecus e error, hook it up to a computer got P0603 code, tried resetting it no luck, if anyone knows where I can find a decent priced tcm pls let me know, so far the cheapest one I found was $695.00.

 

Did you check out www.car-part.com

 

It would help to know what EXACT vehicle you have (MAKE,MODEL,YEAR)

P0603 is for an ECM failure, not a TCM

P0603 EMS
OBD II

ECM Keep alive memory error

Monitoring conditions:
Engine temperature cool
(cooling fans not running)
Remove ignition key for 20
seconds (cooling fans not
running)
Ignition key in, position II for 5
seconds (do not start)
Repeat cycle two additional

times.

Default Action
NONE

POSSIBLE CAUSES
ECM Failure

Could just be a power fault or wiring issue.

bob gauff

 

I just got the same code (P0603) for my 2004 XK8. Engine starts and seems to run fine, but check engine light on. Generic code says could be battery terminals or charge. Have had the car for 6 years and don't think I've ever changed the battery (have to check my records when I get home). Could this be an early indication of battery failure (happened before when I let the car sit for a while - checked the battery connections & cleared the code - went probably 6 months without light), or an ECM/PCM failure?