Error Code |
Code Meaning |
Possible Causes |
12 |
The EEC is unable to control idle |
vacuum leak, TB base idle off ,idle air valve
dirty or bad, EGR stuck open |
13 |
Idle is out of spec. |
same as code 12 |
14 |
Intermittant PIP |
TFI module most likely bad, but mag pickup could
be bad |
15 |
ECM Keep Alive Memory failure |
Battery dead or disconnected, bad power ECM
relay or fuse. Some after market chips can cause this error. |
16 |
RPM to low. |
bad idle air valve, dirty throttle body |
17 |
O2 sensor rich |
Fuel regulator,map sensor bad, no vacuum to
MAP, bad injector,dead O2 sensor. |
18 |
no tach signal |
Bad TFI, bad mag pickup, DIS bad coil |
19 |
ECM failure |
ECM dead or dying |
21 |
21 ECT out of range |
ECT bad, engine not warmed up, bad thermostat,
low coolant. |
22 |
22 MAP out of spec |
Bad MAP sensor, vacuum leak, bad hose to MAP
sensor |
23 |
TPS out of range |
Bad TPS, throttle body base idle mis-set, dirty/sticking
TB, no dynamic response |
24 |
ACT/VAT out of range |
Bad ACT/VAT sensor, on EDIS systems coil 1 bad
|
26 |
VAF/MAF out of range |
Bad VAF/MAF, leaking air hose from sensor to
engine |
27 |
VSS |
Vehicle Speed Sensor bad or unplugged, EDIS
coil 2 bad |
28 |
VAT Sensor Low. |
VAT bad, leak in hose from VAT to engine, EDIS
coil 3 bad, DIS right coil bad |
29 |
Vehicle Speed Sensor low |
Bad or unplugged VSS, |
31 |
EVP/PFE low |
Bad EVP/PFE sensor, no exhaust backpressure
or inopperative EGR |
32 |
EVP/PFE high |
EGR sticking open, bad EVP/PFE sensor, clogged
exhaust or convertor |
33 |
EGR not opening |
Clogged or bad EGR, bad EVP/PFE sensor, and
even a sluggish O2 can set this. |
34 |
EVP/PFE high |
Same as code 32 |
35 |
EVP/PFE high |
Same as codes 32 and 34 |
38 |
ITS open |
Bad or unplugged ITS |
39 |
Lock-up convertor |
Lock-up solenoid bad or unplugged |
41 |
O2 low (lean) |
Vacuum leak, EGR stuck open,bad MAP sensor,
bad O2, clogged fuel filter,weak fuel pump |
42 |
42 O2 high |
Bad O2, bad MAP sensor, Bad fuel regulator,
Leaking injectors, restriction in fuel return line, clogged exhaust
lowering vacuum |
43 |
O2 lean at WOT |
Bad O2, bad MAP sensor, and same as code 41
|
45 |
EDIS |
coil bad EDIS coil 1, 2, 3, or 4 failed |
46 |
EDIS coil |
EDIS coil 2 failed |
47 |
O2 rich, VAF low |
Same as code 42, VAF bad, leak in hose from
VAF to engine, Air filter dirty |
48 |
VAF high, DIS coil |
DIS coil 3 failed, VAF bad. |
49 |
EDIS SAW spout |
TFI bad, spout unplugged, SAW signal bad |
51 |
ECT high |
Bad ECT, sticking thermostat, low coolant,
clogged convertor. |
52 |
PSPS open |
Bad or unplugged PSPS, no dynamic response
|
53 |
TPS high |
Bad TPS, dirty/sticking TB, base idle set wrong,
throttle cable sticking |
54 |
ACT/VAT high |
Bad or unplugged ACT/VAT, inop heated air inlet.
|
55 |
Key power low |
Short in wiring to ECM power, low charging
from alternator. |
56 |
MAF/VAF |
high Bad MAF/VAF |
58 |
VAT high |
Bad VAT |
59 |
Low speed fuel pump |
Bad fuel pump,wiring to pump. |
61 |
ECT low |
Bad ECT, or thermostat, engine not warm, low
coolant. |
62 |
Convertor clutch |
Convertor bad, lockup solenoid bad or unplugged.
|
63 |
TPS low |
Bad or misadjusted TPS, TB base idle mis-set,
binding throttle cable |
64 |
ACT/VAT |
low Bad ACT/VAT |
65 |
Voltage high |
Alternator bad, overcharging, voltage over
17 volts |
66 |
MAF/VAF low |
Bad MAF/VAF, leak in hose from MAF/VAF to engine.
|
68 |
VAT |
low Bad VAT |
70 |
ECM DCL |
Data communication link error, bad ECM |
71 |
ECM software reset |
??? |
72 |
MAP |
No change in MAP signal, no dynamic response
usually sets this. |
73 |
TPS |
No change in TPS signal, no dynamic response
sets this. |
74 |
BOO |
Usually sets when brakes aren't tapped during
dynamic response. |
75 |
BOO closed |
Bad or mis-adjusted BOO switch |
76 |
VAF |
NO change in VAF during dynamic response. |
77 |
No dynamic response |
no one performed the dynamic responses during
code retrieval |
78 |
Power interrupt |
Interruption in ECM power, battery disconnected,
ECM power relay bad. |
79 |
A/C on |
A/C was on during self-test |
83 |
EGR |
Fuel relay Bad or unplugged EGR solenoid, low
speed fuel pump relay bad |
84 |
EGR solenoid |
Same as code 83 |
85 |
CANP, lean limit |
Problem with the CANP, a rich condition causing
the ECM to hit its lean limit. |
86 |
ECM rich limit |
ECM hit rich limit, due to a lean condition,
vacuum leak, fuel filter, fuel pump |
87 |
Fuel pump relay |
Failure of the fuel pump power relay or circuit
|
88 |
COO solenoid |
Failure of the convertor over-ride solenoid,
or circuit |
89 |
LUS/COO solenoid |
Same as code 88 |
91 |
O2 lean |
Bad O2, vacuum leak,fuel pressure low (clogged
filter, regulator, pump) EGR stuck open |
93 |
TPS low |
Same as code 63 |
95 |
Fuel pump |
Fuel pump monitor has seen a fault in the fuel
pumps or circuit |
96 |
High speed fuel pump |
High speed fuel pump or circuit failure |
98 |
Failure mode |
Some failure has set ECM in 'failure effects
mode', bad ECM, or could be about anything |
99
|
ECM cannot control idle |
Usually found with codes 12, and 13. Same things cause it.
|
