P219A with no other codes

ZacharyH · February 20, 2022

I have a 2013 GMC Sierra with a 5.3L V8 I have a P219A code I know it can be the O2 sensors, the fuel injector, or a vac leak but i'm not a rich person so I can't just buy all the parts just because so i'm hoping someone can help me pin down the most likely part to go for.

Problems:

MIL P219A

Little hiccups here and there

Lost of fuel MPG use to average ~ 17-19 MPG now ~ 10-13 MPG HWY

Fixes so far:

Ran fuel system cleaner

Cleaned MAF sensor

New filters

Tried different fuel types

OBD2 Freeze Frame Data:

Parameter Description	Results
DTC that caused required freeze frame data storage	P219A
Fuel Sys 1	CL
Fuel Sys 2	CL
Calc Load	66.3 %
ECT	190 °F
STFT B1	-2.3 %
LTFT B1	-0.8 %
STFT B2	4.7 %
LTFT B2	-1.6 %
Fuel Pres	44 psi
MAP	22 inHg
Eng RPM	2037
Veh Speed	80 mph
Spark Adv	37.0 °
IAT	48 °F
MAF	6.23 lb/min
TPS	39.2 %
O2S B1 S1	0.69 V
STFT B1 S1	-2.3 %
O2S B1 S2	0.66 V
STFT B1 S2	99.2 %
O2S B2 S1	0.08 V
STFT B2 S1	4.7 %
O2S B2 S2	0.66 V
STFT B2 S2	99.2 %
Run Time	290 sec
Command EVAP	100.0 %
Fuel Level	78.0 %
Warm-up DTC Clr	1
Clr Dist	11 miles
EVAP_VP	-3.6 InH2O
BARO	25 inHg
CAT Te 11	1562 °F
CAT Te 21	1562 °F
ECU Volts	14.32 V
LOAD Value	43.9 %
EQ Ratio	1.00
Rel TPS	25.1 %
Ambient	45 °F
TPS B	38.8 %
ACC Pedal D	19.2 %
ACC Pedal E	9.4 %
Command TAC	35.7 %
FUEL_TYP	NONE
ALCH_PCT	11.0 %

Any help would be great.

CamGTP · February 21, 2022

The free test would be pretty simple. Swap the upstream o2 sensors side to side.

If the code changes to a P219B, then that sensor is likely at fault. Or if it gives a code for bank 2 after the o2 sensor swap.

redvett · February 21, 2022

Your freeze frame shows 44 psi fuel pressure and it is low should be 55-62 psi.

CamGTP · February 22, 2022

Not on vehicles with a fuel pump control module. All flex fuel trucks of that era have fuel pump control modules that vary the fuel pressure. Under low load situations the fuel pressure will be in the 40's and only jump to around 58-60 under heavy throttle.

toohi2cu2 · February 24, 2022

The data shows o2 sensor O2S B1 S2 totally different measurement from the other 2, could that sensor be the problem?

ZacharyH · February 24, 2022

Sorry for the late response but I tried to swap the upstream O2 sensors and the and the problem is still there but did seem to take 2 days before I got the check engine light that's why I haven't responded yet still have p219a

yosoy1an2.O · April 22, 2023

when you had this code , did your truck used to make a tick noise coming from bank1?

yosoy1an2.O · April 22, 2023

when you had this code , did your truck used to make a tick noise coming from bank1?

ZacharyH · April 22, 2023

Yes it's been doing that for a while now

swathdiver · April 24, 2023

On 2/20/2022 at 3:32 PM, ZacharyH said:

I have a 2013 GMC Sierra with a 5.3L V8 I have a P219A code I know it can be the O2 sensors, the fuel injector, or a vac leak but i'm not a rich person so I can't just buy all the parts just because so i'm hoping someone can help me pin down the most likely part to go for.

Problems:

MIL P219A

Little hiccups here and there

Lost of fuel MPG use to average ~ 17-19 MPG now ~ 10-13 MPG HWY

Fixes so far:

Ran fuel system cleaner

Cleaned MAF sensor

New filters

Tried different fuel types

OBD2 Freeze Frame Data:

Parameter Description Results

DTC that caused required freeze frame data storage P219A

Fuel Sys 1 CL

Fuel Sys 2 CL

Calc Load 66.3 %

ECT 190 °F

STFT B1 -2.3 %

LTFT B1 -0.8 %

STFT B2 4.7 %

LTFT B2 -1.6 %

Fuel Pres 44 psi

MAP 22 inHg

Eng RPM 2037

Veh Speed 80 mph

Spark Adv 37.0 °

IAT 48 °F

MAF 6.23 lb/min

TPS 39.2 %

O2S B1 S1 0.69 V

STFT B1 S1 -2.3 %

O2S B1 S2 0.66 V

STFT B1 S2 99.2 %

O2S B2 S1 0.08 V

STFT B2 S1 4.7 %

O2S B2 S2 0.66 V

STFT B2 S2 99.2 %

Run Time 290 sec

Command EVAP 100.0 %

Fuel Level 78.0 %

Warm-up DTC Clr 1

Clr Dist 11 miles

EVAP_VP -3.6 InH2O

BARO 25 inHg

CAT Te 11 1562 °F

CAT Te 21 1562 °F

ECU Volts 14.32 V

LOAD Value 43.9 %

EQ Ratio 1.00

Rel TPS 25.1 %

Ambient 45 °F

TPS B 38.8 %

ACC Pedal D 19.2 %

ACC Pedal E 9.4 %

Command TAC 35.7 %

FUEL_TYP NONE

ALCH_PCT 11.0 %

Any help would be great.

Have you changed any of the oxygen sensors? Aftermarket sensors do not play nice with the computer system. Use GM OE only, not even Denso unless it came in the ACDelco/GM box.

MAP sensor readings at idle ought to be between 19-42 kpa. What are your LTFTs at idle once warmed up?

Have you inspected the spark plugs? Does the crankcase oil smell like fuel? Have you triple checked for vacuum leaks on and around the intake manifold and brake booster?